Featured Slider not working

Hi, when I now update the post numbers that are supposed to be shown on the image slider on my home page (http://travelintense.com/), I have three problems: 1. The image does not stretch all over the available width anymore 2. There is no sliding from one post feature image to the next anymore. 3. The space between the bottom of the slider and the four pictures below shrank. Do you have any idea what could have happened and how to solve this problem? I did not add any new plugins the last half a year. Thanks a lot and best regards, Michaela